<template>
<div>
  <!--    面包屑导航区域-->
  <el-breadcrumb separator-class="el-icon-arrow-right">
    <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item>商品管理</el-breadcrumb-item>
    <el-breadcrumb-item>添加商品</el-breadcrumb-item>
  </el-breadcrumb>

<!--  卡片视图-->
  <el-card>
<!--    提示条-->
    <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
<!--   步骤条-->
    <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
      <el-step title="基本信息"></el-step>
      <el-step title="商品参数"></el-step>
      <el-step title="商品属性"></el-step>
      <el-step title="商品图片"></el-step>
      <el-step title="商品内容"></el-step>
      <el-step title="完成"></el-step>
    </el-steps>
<!--    Tabs栏-->
    <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top">
      <el-tabs
          :tab-position="'left'"
          v-model="activeIndex"
          :before-leave="beforeTabLeave" @tab-click="tabClicked">

<!--        基本信息-->
        <el-tab-pane label="基本信息" name="0">
          <el-form-item label="商品名称" prop="goods_name">
            <el-input v-model="addForm.goods_name"></el-input>
          </el-form-item>
          <el-form-item label="商品价格" prop="goods_price">
            <el-input v-model="addForm.goods_price" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品重量" prop="goods_weight">
            <el-input v-model="addForm.goods_weight" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品数量" prop="goods_number">
            <el-input v-model="addForm.goods_number" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品分类" prop="goods_cat">
            <el-cascader
                v-model="addForm.goods_cat"
                :options="categoryList"
                :props="{ expandTrigger: 'hover' ,...categoryProps}"
                @change="handleChange"></el-cascader>
          </el-form-item>
        </el-tab-pane>

<!--        商品参数-->
        <el-tab-pane label="商品参数" name="1">
          <el-form-item
              v-for="(item) in manyTableData" :key="item.attr_id"
              :label="item.attr_name">
            <el-checkbox-group v-model="item.attr_vals">
              <el-checkbox
                  v-for="(cb,i) in item.attr_vals " :key="i"
                  :label="cb"
                  border>
              </el-checkbox>
            </el-checkbox-group>
          </el-form-item>
        </el-tab-pane>

<!--        商品属性-->
        <el-tab-pane label="商品属性" name="2">
          <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData" :key="item.attr_id">
            <el-input v-model="item.attr_vals"></el-input>
          </el-form-item>
        </el-tab-pane>

<!--        商品图片-->
        <el-tab-pane label="商品图片" name="3">
          <el-form-item>
            <el-upload
                :action="uploadURL"
                :headers="headerObj"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                :on-success="handleSuccess"
                list-type="picture">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品内容" name="4">
<!--          富文本编辑器-->
          <quill-editor class="ql-editor" v-model="addForm.goods_introduce">

          </quill-editor>
          <el-button type="primary" class="add_goods_button" @click="add">添加商品</el-button>
        </el-tab-pane>
      </el-tabs>
    </el-form>
  </el-card>
<!--  图片预览对话框-->
  <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
    <img :src="previewPath" class="previewImg" alt="">
  </el-dialog>
</div>
</template>

<script>
import _ from "lodash"
export default {
  name: "GoodsAdd",
  data(){
    return{
      // 步骤条激活索引
      activeIndex:'0',
      // 添加商品的表单数据对象
      addForm:{
        goods_name:"",
        goods_price:0,
        goods_weight:0,
        goods_number:0,
        goods_cat:[],
        pics:[],
        // 富文本编辑器内容
        goods_introduce:"",
        // 参数数组
        attrs:[]
      },
      // 添加商品的表单验证规则
      addFormRules:{
        goods_name:[
          {required:true,message:"请输入商品名称",trigger:"blur"}
        ],
        goods_price:[
          {required:true,message:"请输入商品价格",trigger:"blur"}
        ],
        goods_weight:[
          {required:true,message:"请输入商品重量",trigger:"blur"}
        ],
        goods_number:[
          {required:true,message:"请输入商品数量",trigger:"blur"}
        ],
        goods_cat:[
          {required:true,message:"请选择商品分类",trigger:"blur"}
        ],
      },
      // 商品分类数据
      categoryList:[],
      // 级联选择器的配置对象
      categoryProps:{
        label:'cat_name',
        value:'cat_id',
        children:"children"
      },
      // 动态参数列表
      manyTableData:[],
      // 静态属性列表
      onlyTableData:[],
      // 图片上传地址
      uploadURL:"http://127.0.0.1:8888/api/private/v1/upload",
      // 图片上传的头信息
      headerObj:{
        Authorization:window.sessionStorage.getItem("token")
      },
      // 图片预览的路径
      previewPath:"",
      //控制图片预览的对话框的显示与隐藏
      previewVisible:false
    }
  },
  methods:{
    // 获取所有商品分类数据
   async getCategoryList(){
      const {data:res} = await this.$http.get("categories")
     if(res.meta.status !== 200) return this.$message.error("获取商品分类数据失败")
     this.categoryList = res.data

    },
    // 监听级联选择器发生变化
    handleChange(){
      if(this.addForm.goods_cat.length!==3) {
        this.addForm.goods_cat=[]
      }
    },
    // 监听Tab栏跳转
    beforeTabLeave(activeName,oldActiveName){
     let validResult = false
     this.$refs.addFormRef.validate(valid=>{
       validResult = valid
     })
      if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3 && !validResult){
        this.$message.error("请填写完整的基本信息")
        return false
      }
    },
    // Tab栏被点击事件
   async tabClicked(){
     if(this.activeIndex === "1"){
       // 获取商品动态参数
       const {data:res} = await this.$http.get(`categories/${this.cateID}/attributes`,{
         params:{sel:"many"}
       })
       if(res.meta.status !== 200){
         return this.$message.error("获取动态参数失败")
       }
     res.data.forEach((item)=>{
       item.attr_vals = item.attr_vals.length === 0? [] : item.attr_vals.split(",")
     })
       this.manyTableData = res.data
     }

     else if(this.activeIndex === "2"){
       //获取商品静态属性
       const {data:res} = await this.$http.get(`categories/${this.cateID}/attributes`,{
         params:{sel:"only"}
       })
       if(res.meta.status !== 200){
         return this.$message.error("获取静态属性失败")
       }
     this.onlyTableData = res.data
     }
    },
    // 图片上传成功
    handleSuccess(response){
     //1、 拼接得到一个图片对象
      const picInfo = {pic:response.data.tmp_path}
     // 2、将图片信息添加到表单中
      this.addForm.pics.push(picInfo)
    },
    // 图片预览
    handlePreview(file){
     //1、获取URL地址
      this.previewPath = file.response.data.url
      //2、显示对话框
      this.previewVisible = true
    },
    //图片移除
    handleRemove(file){
     // 1、获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2、从pics数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3、调用数组的splice方法,把莆田信息对象，从pics数组中移除
      this.addForm.pics.splice(i,1)
    },
    // 添加商品
    add(){
     this.$refs.addFormRef.validate(async valid=>{
       if(!valid){
         return this.$message.error("请填写必要的商品信息")
       }
       // 处理动态参数
       this.manyTableData.forEach(item=>{
         const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals.join(",")}
         this.addForm.attrs.push(newInfo)
       })
       //处理静态属性
       this.onlyTableData.forEach(item=>{
         const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals}
         this.addForm.attrs.push(newInfo)
       })
       // 由于级联选择器需要的是数组，后端需要的字符串，所以不能直接将数组改为字符串
       // 解决方法是深拷贝addFrom
       const form = _.cloneDeep(this.addForm)
       form.goods_cat = form.goods_cat.join(",")

       const {data:res} = await this.$http.post("goods",form)
       if(res.meta.status !== 201){
         return this.$message.error("添加商品失败")
       }
       this.$message.success("添加商品成功")
       this.$router.push("/goods")

     })
    }
  },
  computed:{
    cateID(){
      if(this.addForm.goods_cat.length === 3){
        return this.addForm.goods_cat[2]
      }else{
        return null
      }
    }
  },
  created() {
    this.getCategoryList()
  }
}
</script>

<style scoped>
.el-checkbox{
  margin: 0 10px 0 0 !important;
}
.previewImg{
  width: 100%;
}
.add_goods_button{
  margin-left: 15px;
}
</style>